Transmission scheme for sc-fdma with two dft-precoding stages
OwnerJune Chul Roh, Pierre Bertrand +1inventors
InventorsJUNE CHUL ROH, PIERRE BERTRAND, JUN YAO
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Abstract
A method of operating a wireless communication system is disclosed. The method includes receiving first and second parallel data streams. The first data stream is converted to a first frequency-domain data stream by a discrete Fourier transform (DFT) having NDFT0 size, where NDFT0 is a positive integer. The second data stream is converted to a second frequency-domain data stream by a DFT having NDFT1 size, where NDFT1 is a positive integer. The first and second frequency-domain data streams are mapped to respective subcarriers.
Claims6
A method of operating a communication system, comprising:
- receiving a first data stream;
- mapping the first data stream into a first series of quadrature amplitude modulated (QAM) symbols;
- producing, by a first pseudorandom noise generator in an apparatus, a first pseudorandom noise (PN) sequence;
- mapping, by a first symbol mapper circuit in the apparatus, a plurality of bits of the first PN sequence to a first phase pilot symbol;
- inserting, by a first phase pilot symbol insertion circuit in the apparatus, the first phase pilot symbol into the first series of QAM symbols;
- converting, by a first discrete Fourier transform (DFT) circuit in the apparatus, the first data stream to a first frequency-domain data stream by a DFT having NDFT0 size after the step of inserting, wherein NDFT0 is a positive integer;
- mapping, by a subcarrier mapping circuit in the apparatus, the first frequency-domain data stream to respective first subcarriers;
- converting, by a first inverse discrete Fourier transform (IDFT) circuit in the apparatus, the respective first subcarriers to a first time-domain data stream by an IDFT having size NFFT, where NFFT is a positive integer;
- receiving a second data stream in parallel with the first data stream;
- mapping the second data stream into a second series of QAM symbols, wherein mapping the second data stream into the second series of QAM symbols is in parallel with mapping the first data stream into the first series of QAM symbols;
- producing, by a second pseudorandom noise generator in the apparatus, a second pseudorandom noise PN sequence;
- mapping, by a second symbol mapper circuit in the apparatus, a plurality of bits of the second PN sequence to a second phase pilot symbol;
- inserting, by a second phase pilot symbol insertion circuit in the apparatus, the second phase pilot symbol into the second series of QAM symbols;
- converting, by a second DFT circuit in the apparatus, the second data stream to a second frequency-domain data stream by a discrete Fourier transform (DFT) having NDFT1 size, wherein NDFT1 is a positive integer;
- and
- mapping, by the subcarrier mapping circuit in the apparatus, the second frequency-domain data streams to respective second subcarriers.
Dependencies are inferred from the claim text.